Exterior of a cup



FIG. 1 is a front perspective view of an exterior of a cup showing my new design;

FIG. 2 a rear perspective thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a left side elevation view thereof; the right side being a mirror image;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a rear elevation view thereof. 

The ornamental design for an exterior of a cup, as shown and described. 